126 HETEROMERA. 
D. ferrugineus, Kirsch, from Bogota; it differs, however, in its entirely ferruginous legs 
and antenne and other particulars. The shorter and stouter antenne, shining thorax, 
less elongate elytra, and smaller and more convex eyes distinguish it from D. concolor. 
DIPLECTROIDES. 
Mandibles narrowing to the apex, the apex not cleft; last joint of the maxillary palpi long, elongate- 
triangular, the apical side only about half the length of the inner side, the apex obliquely rounded 
off, that of the labial palpi of somewhat similar shape; eyes finely granulated, convex, very large, 
still larger and more approximate in the male (smaller and more distant in D. flavicollis, 2 ), feebly 
emarginate ; antenne 11-jointed in both sexes, exceedingly elongate in the male, reaching nearly to the 
apex of the elytra, shorter in the female, joint 2 very short, one-third or one-fourth the length of 3, 3 
and 4 subequal, 11 slightly constricted beyond the middle (giving the appearance of a twelfth joint), 
prothorax much as in Diplectrus (shorter in D. flavicollis, 2); elytra very elongate, broadest at the base, 
the sides rectilinear or nearly so and gradually converging to the apex, the dise with very vague coste or 
rows of double lines ; legs very long; anterior tibie with two spurs; tarsi with all the joints except the 
apical one clothed with a dense brush of short hairs beneath; claws feebly dilated at the base; the rest as 
in Diplectrus. Male with the fifth ventral segment deeply triangularly emarginate; the ventral portion 
of the sixth segment very largely developed, furnished with two very large, long, spoon-shaped pieces 
‘(placed one above the other in repose, resembling two additional segments) which extend far beyond the 
fifth segment, the dorsal portion of the sixth short and without lateral appendages. 
A single species from Mexico and Guatemala is referred to this genus, and a second, 
from Mexico, of which female examples only have been received as yet, is also provi- 
sionally included in it. Both are of large size and resemble the larger species of the 
Malacoderm-genus Chauliognathus inhabiting the same region. ‘The above characters 
are chiefly taken from D. longicornis. In the male of this latter the antenne are 
exceedingly elongate; the eyes are very large and separated by quite a narrow space 
above; the ventral portion of the sixth segment is very largely developed (the dorsal 
portion being quite short), and the two, long, broad, spoon-shaped pieces with which it 
is furnished lie one above the other in repose and extend far beyond the deeply emar- 
ginate fifth segment (in Diplectrus the sixth segment is often only visible through 
the emargination of the fifth, and though divided down the middle it lies quite flat in 
repose), the sheath of the cedeagus being, apparently, unaccompanied by an additional, 
separate, spoon-shaped piece on each side. In both sexes of D. longicornis the elytra 
(when closed along the suture) are distinctly broadest at the base, and very gradually 
and rectilinearly narrowed to the apex. 
1. Diplectroides longicornis. (Jab. VI. figg. 5,¢; 5a, labium; 54, maxilla 
and maxillary palpus; 5c, cedeagus.) 
Very elongate, yellowish-brown, with the prothorax, the head in front, and the scutellum of a more flavous or 
orange tint, and the head between and behind the eyes and the base of the elytra faintly suffused with viola- 
ceous or bluish-violaceous; the head in some examples entirely of the latter colour; the elytra sometimes 
with the apex as well as the base very distinctly marked with violaceous or bluish-violaceous, and the rest of 
the surface often faintly suffused with violaceous or purplish, in one example entirely violaceous with the 
base and extreme apex bluish; the upper surface very densely clothed with short ashy pubescence, and 
